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NY bill would require a criminal history background check for the purchase of a 3D printer
(www.nysenate.gov)
This is a most excellent place for technology news and articles.
Private party transfers of anything can't really be forced to abide background checks. If you want to buy a used printer from your friend you can just buy it, not inform the government, and skirt any background check requirements.
So you want a deliberate "3D printer show" loophole?
Other countries have absolutely no problem whatsoever enforcing background checks for private firearm transfers. Claiming it can't be done is a self-serving lie.